Correct Answer:
B. Aware
An antonym is a word opposite in meaning to another. 'Unmindful' means not conscious or aware of something; heedless or oblivious.
- Aware is the correct antonym. It means having knowledge or perception of a situation or fact, which is the direct opposite of being unmindful.
- Ignorant is incorrect because it is a synonym or closely related term to unmindful, meaning lacking knowledge or awareness.
- Brave is incorrect because it refers to courage and is unrelated to awareness or mindfulness.
- Careless is incorrect because it is a synonym or closely related term to unmindful, implying a lack of attention or concern.